Large for gestational age (LGA)

Definition

Large for gestational age (LGA) means that a fetus or infant is larger or more developed than normal for the baby's gestational age.

Alternative Names

Information

Gestational age is a measure of the growth and development of the fetus in the uterus and the infant after birth. LGA refers to a fetus or infant who is larger than expected for the age and gender. It can also mean an infant with a birth weight above the 90th percentile.

The measurement is based on the estimated gestational age of the fetus or infant. The infant’s or fetus’ actual measurements are compared with normal height, weight, head size, and developmental of an fetus or infant of the same age and gender.

Common causes of the condition are:

Gestational diabetes

Prolonged pregnancy

A baby that is large for gestational age has a higher risk of birth injury. There is also a risk of complications of low blood sugar after delivery.

Version Info

Linda J. Vorvick, MD, Medical Director and Director of Didactic Curriculum, MEDEX Northwest Division of Physician Assistant Studies, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.

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